利用高精度时频信号测定重力位  

Determining the gravity potential by high precision time-frequency signal

作　　者：张朋飞 申文斌[1,2] 徐炜 申子宇 ZHANG Pengfei;SHEN Wenbin;XU Wei;SHEN Ziyu(School of Geodesy and Geomatics,Mapping and Remote Sensing,Wuhan University,Wuhan 430079,China;State Key Laboratory of Information Engineering in Surveying,Mapping and Remote Sensing,Wuhan University,Wuhan 430079,China;School of Resource,Environmental Science and Engineering,Hubei University of Science and Technology,Xianning 437100,Hubei China)

机构地区：[1]武汉大学测绘学院,湖北武汉430079 [2]武汉大学测绘遥感信息工程国家重点实验室,湖北武汉430079 [3]湖北科技学院资源环境科学与工程学院,湖北咸宁437100

出　　处：《华中科技大学学报（自然科学版）》2022年第9期62-69,共8页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(42030105,41721003,41804012,41631072,41874023);中国科学院空间科学与应用总体部科学实验项目((2020)228);湖北省自然科学基金资助项目(2019CFB611)。

摘　　要：与传统测量方法相比,利用高精度时频信号测定重力位更加快捷,可实现陆地与岛屿之间的重力位差测定.进入21世纪以来,随着原子钟的精度不断提高,使得高精度时频信号测定重力位成为可能,相对论方法测定重力位逐渐成为全球研究热点,并取得了重要进展与成果.这里介绍了高精度时频信号测定重力位的基本原理,包括光纤电缆信号传递、激光时间传递、卫星双向时频传递、GNSS共视时频传递、GNSS载波相位时频传递、卫星频率信号传递和VLBI时频信号传递等测定重力位的方法和技术,并讨论了时频信号传递测定重力位的发展趋势.未来原子钟精度达到10量级时,有望在厘米级精度测定重力位和海拔高.Compared with the traditional measurement method,the gravity potential difference between land and island can be precisely measured without difficulty using high-precision time-frequency signals.Since entering the 21st century,with the continuous improvement of the precision of atomic clocks,it has become prospective to measure the gravity potential by high-precision time-frequency signals.Using general relativity to determine gravity potential gradually became a global research focus and made significant progress and achievements.This paper introduces the basic principle of determining the gravity potential by high-precision time-frequency signals,which include the time-frequency transfer by optical fiber and cable links,laser time transfer,two-way satellite time-frequency transfer,GNSS common-view time-frequency transfer,GNSS carrier phase time-frequency transfer,frequency signals transfer between satellites and the ground stations,and VLBI time-frequency signal transfer,and other gravity potential determination methods and technologies.It discussed the trend of gravity potential measurement by time-frequency signal transmission.In the near future,it is expected to measure gravity potential and altitude with centimeter accuracy when the atomic clocks reach an accuracy level of 10.

关 键 词：时频大地测量 广义相对论 高精度时频信号 重力位 时频信号传递 

分 类 号：P223[天文地球—大地测量学与测量工程] P312[天文地球—测绘科学与技术]